My question is when I have multiple PCs playing COD on the same LAN how to handle port forwarding since each port can only be forwarded to 1 PC at a time. I read that the port range for COD Ghost is 27000-27050. Should I be configuring my router to forward a portion of this range to different PCs (eg: PC1 get 27000-27025; PC2 gets 27026-27050)or should I just do the port forwarding for 1 PC with the consequence being there is not much else I can do if my NAT is restricted on all other PCs.

1) Hit start and search for and open CMD
2) Type in IPconfig and hit enter, look at your IPV4 Address, either write it down or copy it.
3) Click Start again and type into the search bar Network
4) Click on Network
5) You should be able to see your Modem, Right click on it and click Properties
6) Click Settings
7) You should see several services called DemonwarePortMapping, just click edit on each of them until you find the one that has 3074 internal and external.
8) Delete the one that has 3074 internal + external
9) Click Add
10) Name it whatever you want, type your IPV4 Address you saw earlier into the IP Address field, type in 3074 as the internal and external, and then click UDP.
11) You should now have an open NAT!